Anthropic releases Claude Opus 5.5

On September 22, 2026, Anthropic released Claude Opus 5.5. According to official materials, the model ranks first on Artificial Analysis's Intelligence Index v4.3 with a score of 58, 7 points higher than Claude Opus 5, and tops Vals AI's Vals Index at 69.69%; it supports up to 1 million tokens of input and 128,000 tokens of output, with reasoning enabled by default across five levels, and API pricing at $4/$0.25/$20 per million input/cached/output tokens. Earlier reports said its output price was $20 per million tokens, lower than the previous generation's $25. On September 23, Yuchen Jin said it was about 30% faster and about 40% cheaper per task than Opus 5. On September 25, Thomas Wolf said he used Opus 5.5 to generate a video from a Google Doc. On October 4, Ado Kukic said that using Opus 5.5 at medium and high effort he did not hit the 5-hour limit, using at most about 74% in a single session. On October 9, Ado again said that the weekend after Opus 5.5's release was his most productive coding day of the year so far. During the same period, Anthropic also released Sonnet 5.5 and Haiku 5.5, and lowered Sonn

AI-generated from public reports

1. Report date Oct 9· 1 reports

   English translation is being prepared.

   Source:Ado Kukic
2. Oct 8· 7 reports

   English translation is being prepared.

   Source:Claude Devs
3. Oct 8· 1 reports

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   Source:Claude Devs
4. Oct 4· 1 reports

   English translation is being prepared.

   Source:Ado Kukic
5. Report date Sep 28· 4 reports

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   Source:The Decoder
6. Sep 25· 1 reports

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   Source:Thomas Wolf
7. Report date Sep 23· 1 reports

   English translation is being prepared.

   Source:Yuchen Jin
8. Report date Sep 22· 4 reports

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   Source:TechCrunch AI